I scanned 5 popular OSS repos in 5 minutes. Here's what I found.

Earlier today I shipped scan.html: a one-page in-browser tool that takes any public GitHub repo URL, fetches its .github/workflows/*.yml, and returns a per-workflow report using ci-doctor (14 rules) and gha-budget (per-job pricing). Runs entirely client-side via the GitHub public API. No signup, nothing uploaded.

To make sure it actually works on real-world repos and not just on the canned examples I built it against, I picked 5 well-known npm-ecosystem repos that I had not specifically optimized for, and ran them through. All 5 are maintained by experienced engineers. None of these are random small repos; they all matter.

The 5 repos

Repo	Workflows	Per-run $	Modeled $/mo*	Findings (err / warn / info)
axios/axios	8	$2.62	$2,362	40 (12 / 27 / 1)
eslint/eslint	8	$1.54	$1,382	46 (0 / 40 / 6)
vitejs/vite	12	$1.09	$979	26 (0 / 25 / 1)
prettier/prettier	17	$1.02	$922	32 (6 / 23 / 3)
sveltejs/svelte	5	$0.70	$634	14 (0 / 10 / 4)
Total	50	$6.97	$6,279	158 (18 / 125 / 15)

*Modeled at 30 runs/day, 8 min/job, on standard ubuntu-latest GitHub-hosted runner pricing. Real spend depends on actual run frequency, runner choice, and OSS rate-limit credits. The point of the column is comparison, not accusation.

The same 3 rules show up in all 5 repos

This is the part I find genuinely interesting. These repos have nothing in common architecturally - vite is a bundler, axios is an HTTP client, eslint is a static analyzer, etc. - but the top-3 ci-doctor findings are nearly identical across all of them:

1. missing-timeout (76 hits across 5 repos). No timeout-minutes: on jobs, so a hung step bills until GitHub's 6-hour default cap. Every repo has this.
2. missing-concurrency (20 hits). Push 3 commits to a PR in 30 seconds, you get 3 stacked CI runs and GitHub bills all 3. concurrency: with cancel-in-progress: true kills the first 2 in milliseconds. Free 30-50% CI savings on PR-heavy repos.
3. missing-cache (16 hits, mostly in eslint). actions/setup-node without cache: 'npm' / 'pnpm' / 'yarn' means every job re-downloads node_modules. Slow and expensive.

The interesting outlier is axios/axios with 12 error-severity findings. All 12 are deprecated-action: workflows still pinned to actions/checkout@v3, actions/setup-node@v3, and actions/upload-artifact@v3. v3 of upload-artifact was deprecated in late 2024 and the v3 endpoint is being shut off. These are not "save 3% of your CI bill" findings; these are "your CI will silently start failing" findings.

Why these specific 3 are everywhere

My theory: GitHub Actions doesn't push you to add any of them. The workflow files YAML-validates fine without a timeout, without concurrency, without a cache. The CI passes. The PR ships. There is no linter built in to nudge anyone toward better defaults. So the same 3 smells survive in every repo I scan, including in mine before I built ci-doctor.

This is a tooling problem, not a competence problem. The maintainers of all 5 of these repos are excellent engineers. The smells are just invisible until something points at them.

What to do about it (5-minute fixes)

For each of the top 3 rules, here's the smallest possible change:

1. Add a job-level timeout

jobs:
  test:
    runs-on: ubuntu-latest
    timeout-minutes: 15   # <-- add this
    steps: ...

2. Add concurrency at workflow scope

# top of every workflow that runs on PRs
concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
  cancel-in-progress: true

3. Tell setup-node what package manager you use

- uses: actions/setup-node@v4
  with:
    node-version: '20'
    cache: 'npm'      # or 'pnpm' or 'yarn'

Or just run npx ci-doctor --fix and let it patch missing-concurrency, missing-timeout, wide-trigger, and artifact-no-retention in place. The other 10 rules need a human to look at them, but those 4 are mechanical.

Run this scan on your own repo

Free, browser-only, no signup: https://depmedicdev-byte.github.io/scan.html

Paste any public GitHub repo URL. Get the same per-workflow report above for your own code in about 10 seconds. Shareable result URL. Nothing uploaded.

Methodology

• All 5 repos were pulled via the GitHub public API, no auth.
• Each .github/workflows/*.yml was passed through ci-doctor 0.4.1 (14 rules) and gha-budget for per-job pricing.
• Cost = sum of all jobs at GitHub-hosted standard ubuntu-latest rates, assuming 8 min/job.
• Monthly = per-run * 30 runs/day * 30 days. Self-hosted and large-runner jobs are unpriced.
• This is the same engine that runs in the browser at /scan.html. The 20-repo version of this analysis lives at /benchmarks.html with per-repo deep dives.

What this is NOT

This isn't an attack on any of these projects. They all ship excellent software, and "modeled $/mo" is not the same as "actual $/mo" - large OSS projects get free GitHub Actions credits, run things conditionally, and use self-hosted runners for the heavy lifting. The point is that the same three workflow-YAML patterns show up in every repo I scan, including mine before I started building ci-doctor.

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Free CLIs: ci-doctor, gha-budget, pin-actions. All MIT.

If the in-browser report flags 5 things in your workflow and you'd rather just copy a known-good template than fix one rule at a time, the Cut Your CI Bill cookbook ships 30 production patterns: monorepo dispatch, OIDC publish, security gates, matrix trims, the works. $19 one-time, MIT-licensed templates. https://depmedicdev-byte.github.io